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Core Maths 4: Differentiation...another not getting the same answer as the book

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  1. Offline

    Hi there

    Please could you tell me who is correct, many thanks;

  2. Offline

    The book is correct

    Look after you equation where you multiplied by -1/3
    -\frac{1}{3}\cdot (-\frac{3}{\sqrt{2}})=\frac{1}{ \sqrt{2}}
    \frac{1}{\sqrt{2}}+\frac{1}{\sqr  t{2}}=\sqrt{2}
  3. Offline

    Book's right for the tangent, as ztibor says.

    And you're right for the normal.
  4. Offline

    and thank you I understand that now, what about the second question?
  5. Offline

    Did you see my previous post?
  6. Offline

    ok thank you


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